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Sampling Equipment <br /> - l <br /> Lnterxrn gas sampling probes were used to monitor subsurface gases at the landfill <br /> Each probe consists of a <br /> 5-foot long, britt ;diameter stainless steel -Perimeter. <br /> pi with /. tach hole <br /> staggered every 2 inches at the bottom 18 inches.-to allow for gases-to migrate s <br /> into the probes. e <br /> poiwted tip was welded to the end of the probe for better penetration. <br /> A ball valve and brass fitting were installed at the top of each probe to contain gas pressures and <br /> facilitate instrumew hook-up to the probe.The valves were left closed a kcept during monitoring <br /> or instrument reading .Each probe is tagged with a brass plate and identified as "GP-I" through <br /> "GP-10.% <br /> AGA-90 Landtec Infra-red-Gas Analyzer was used to monitor methane, carbon.dioxide.(CW, <br /> and oxygen(02)levels at each probe location.The analyzer was calibrated for methane,COQ,and <br /> OZ prior to use in the field-Calibradon_logs am.included.in thjsreporL- <br /> Gas 11rMo3ritoring - <br /> Ambient air measurements of methane, oxygen, carbon dioxide:; and barom <br /> etpc pressure wem <br /> ® taken at each gas probe location- Those madings were accorded and the ' <br /> xustumeut° was <br /> connected to the probe- Jhe valve was opened and Pmbc.•g s pressure measm-crnents were taken._ <br /> The probe was thea purged for. two probe volumes. Rea,fimgs were theca con==ed at <br /> aPProximately 30- to W-second intexvais. _a stable reading was .obtained... These <br /> measurements of methane, oxygen. carbon diaxide.,and ambiens barometric pressure v tre then - <br /> recorded. Monitoring was also coarcted at vujous, locations in three building sites for the <br /> Presence of methane gas. Monitoring was conducted at the office trailer at the entrance to the <br /> landfill, trailer boxes at the service shop, and trailer boxes at the transfer building_ These <br /> locations were monitored for any gas pockets at the foundation and near any opening from the: <br /> floor such as piping holes,electrical conduits,or floor cracks. <br /> LYSE S <br /> Lysimcte;rs were sampled using the following standard protocol: <br /> l- Prior to sampling lysimeters,the pressure-vacuum equipment is checked and cleaned. <br /> 23-483844-170 112310Rm A•12 <br /> ® 2000 Kteta6ctda,tor. halt'l4,2040 <br />